Th 



e 



Journal of Heredity 



(Formerly the American Breeders' Magazine) 



Vol. VIII, No. 7 



Julv, 1917 



CONTENTS 



Was This the First Form of Life on the Globe? (Frontispiece) 



Feeble-minded in Ohio, by Mina A. Sessions 291 



Some Eugenic Aspects of Military Registration, by Roswell H. 

 Johnson 298 



Eugenics and Military Pensions 298 



Large Families 299 



Horned Horses, by J. E. Miller 303 



Survey of Musical Ability in Schools 305 



Variation in Artichokes, by A. D. Shamel 306 



The Egg Production of White Leghorns 3C9 



Remarkable Buttonballs, by R. W. Shufeldt 310 



Why the Cabbage Butterfly Does Not Increase More Rapidly 312 



Bull Terrier Breeding, by Robert Duncan Coombs 314 



Men and Rats Learn in the Same Way 319 



A Hit-or-miss Universe (Review of a Book by Jacques Ix>ob) 320 



A. G. A. Publications Wanted 334 



The Prevention of Crime 334 



Wheat-rye Hydrids, by Edgar A. McFadden 335 



The Journal of Heredity is published monthly by the American Genetic 

 Association (formerly called the American Breeders' Association) for the benefit 

 of its members. Canadian members who desire to receive it should send 25 cents 

 a year, in addition to their regular membership dues of $2, because of additional 

 postage on the magazine; foreign members pay 50 cents extra for the same 

 reason. Subscription price to non-members, $2.00 a year, foreign postage extra; 

 price of single copies. 25 cents. 



Entered as second-class matter February 24, 1915, at the postofiice at Washing- 

 ton, D. C, under the act of August 24, 1912. Contents copyrighted 1917 by the 

 American Genetic Association. Reproduction of articles or parts of articles 

 permitted provided proper credit is given to author and to the Journal of Heredity 

 (Organ of the American Genetic Association), Washington, D. C. 



Date of issue of this number, June 30, 1917. 



